Final answer:
Harmon and Grace got married in the early 1920s after meeting at a veterans' dance.
Step-by-step explanation:
Harmon and Grace got married the following spring after meeting at a veterans' dance. There are no specific dates provided in the given information, but it can be inferred that their marriage would have taken place sometime in the early 1920s.
Grace MacPherson Livingston, who was initially married to Major David Livingston, lived in northern British Columbia for much of her early married life.